Cutter-head for grooving and jointing machines.



No. 873,093. PATENTED DEG. 10. 1907. H. B. ROSS. CUTTER HEAD FORGROOVING AND JOINTING MACHINES.

APPLICATION FILED JAN. 19, 19Q'I.

2 SHEEN-SHEET 1.

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No. 873,093. PATENTBD DEC. 10, 1907.

H. B. ROSS.

BUTTER HEAD FOR GROOVING AND JOILiTING MACHINES.

Arnwumn FILED JAN. 19,1901.

2 SHEETS-SHEET 2.- I

UNITED srnrns PATENT oFFron.

HARRY B. ROSS, OF BELOIT, WISCONSIN, ASSIGNOR TO THE BERLIN MACHINE WORKS, OF

BELOIT, WISCONSIN, A CORPORATION OF WISCONSIN.

CUTTER-HEAD FOR GROOVING AND JOINTING MACHINES.

Specification of Letters Fatent.

Patented Dec. 10, 1907.

Application filed January 19. 1907- Serial No. 353091.

V in the county of Rock and State of W'isconsin, have invented certain new and useful Improvements in Cutter-Heads for Grooving and Jointing Machines, of which the following is a specification.

This invention relates to cutter-heads such as are employed in machines for making tongue and groove joints, as in'flooring, etc.;

and has reference more particularly to a novel means for mounting and securing the cutters in the head. Cutters-head of this type are commonly provided with two alternate series of cutters, the cutters of one series being designed to plane the edge of the board to form the joint, and the cutters of the other series projecting beyond the path of the cutting edges of the first series and serving to cut the groove or mortise. In order that the work of the cutter-head may be perfectly accurate and true it isessential that both series of cutters be held with fect rigidity against either longitudina or lateral displacement while at work, and one object of my invention is to provide a construction wherein this is effected in a superior degree.

To this and other ends the invention consists in the novel combinations and arrangements of parts in a cutter-head as hereinafter described and more particularly defined in the appended claims.

My invention will be readily understood when considered in connection with the accompanying drawings showing .a practical embodiment of the same, wherein,

Figure 1 is a side elevational view of the complete cutter-head; Fig. 2 is an edge elevational view of the same; Fig. 3 is an inside elevational view of the clamp for securing the grooving knives; Figs. 4 and 5 are sectional details on the lines 44 and 55 of Fig. 3, respectively; Figs. 6 and 7 are detail cross-sectional views on the lines 66 and 7-7 of Fig. 1, respectively; and Fig. 8 is a detail view, illustrating the slightly staggered or angularly ofl'set relation of the grooving knives.

Referring to the drawings, 6 may designate as an entirety the head-piece, the same being provided on one side with a hub 7 by which it may be secured on the driving shaft. The head-piece 6 is provided at intervals er- I around its axis with transverse bolt-holes 8 and 9 adapted to receive the securing bolts of the jointing and grooving knives or bits, respectively. The inner face of the head piece 6 is further provided with tangentially disposed channels 10 intersecting the several holes 8, respectively, said channels being of a size and depth to receive and snugly fit the upper edge portions of the several jointing knives 11. To secure said jointing knives in and to the head-piece 6, I provide a series of bolts 12 each having formed therethrough a longitudinal slot 13 adapted to receive and snugly fit laterally the jointing knife 11, as.

best shown in Fig. 7, and of a length somewhat in excess of the width of the knife. The outer projecting ends of the bolts are threaded and equipped with nuts 15. To secure the blade 11 in position in the head, or remove the same, it-is necessary only to loosen the nut 15 and partially withdraw the bolt 12, whereupon the knife may be readily in serted into or withdrawn from the channel 10 and slot 13. In securing the knife in place, after it has been inserted through the slot 13, with its upper edge lying in the channel 10 of the head, by simply tightening up the nut 15 the knife is drawn into full engagement with the channel, which effectively prevents any lateral or angular displacement of the blade; While the grip of the bolt on the opposite edge of the knife securely holds the latter against longitudinal displacement.

Referring next to the means for securing the grooving knives in place, 16 (Fig. 3) may designate as an entirety a detachable clampmember provided with a central hole 17 for the passage of the driving shaft, and further provided with a series of holes 18 grouped at intervals around its axis, said holes 18 being adapted to register with the holes 9 of the head, and with the latter receiving the clamping bolts 19 by which the clamp-plate 16 is drawn against the head so as to clamp the grooving knives 2O therebetween, as best shown inFig. 6. The edges of the clampplate 16 are preferably cut away or notched as shown at 21, so as to clear the bolts 12 and knives 11, as will be apparent by the dotted line illustration of the position of the clamp-plate 16 relatively to the head shown in Fig. 1. The inner face of the clamp-plate 16 is also provided with tangentially disposed shallow grooves or channels 22 which receive one side of the knives 20, as plainly shown in Fig. 6; and it will be observed that each of said grooves extends across one side of the bolt-hole 18, and that the bolt 19 is provided with a transverse notch 23 adapted to be engaged by the inner edge of the knife. The notch 23 is of a slightly greater width than the width of the knife, which permits ready insertion of the knife and subsequent tightening of the clamp-plate against the knives by turning up the nuts 24, the bolts 19 being provided with heads 25 engaging the outer face of the clamp-plate 16.

The described construction involvin the engagement of one edge of the knife by a flattened surface on the bolt serves the double function of preventing the bolt from turning and thus becoming loose, and supplementing the lateral support offered to the knife by the inner wall of the groove or channel 22. The notch 23, being of slightly greater width than the knife engaged thereby, permits the ready insertion and withdrawal of the knife by simply loosening the nut 24 and slightly retracting the bolt.

In the preferred construction herein shown, the alternate series of grooving knives or bits are disposed in a slightly offset or angularly staggered relation to each other in the plane of rotation somewhat on the principle of the set of the teeth of a cross-cut saw, for the purpose of reducing the heat of friction and preventing burning or blackening of the ma terial operated upon when the feed is interrupted with the material engaged with the tool. To facilitate this, the alternate channels 22 of the clamp-plate are slightly inclined in opposite directions, as indicated in the detail views, Figs. 4 and 5, and similar shallow channels 26 are formed in the inner side of the head-piece to engage the grooving knives 20, with the result of effecting a slight lateral offset in opposite directions of the cutting edges or points of the alternately disposed series of knives, which relieves the sides or edges of the knives of frictional contact with the side walls of the groove or mortise, as shown in Fig. 8.

From the foregoing it will be seen that the described means for securing the knives or cutters permits any one of them to be readily withdrawn and replaced by simply loosening its securing bolt and without disturbing the other knife-securing means. It will also be observed that both series of cutters are very rigidly held in proper relation to each other a ainst both lateral and longitudinal displacement.

I claim:

1. In a cutterhead, the combination with a head-piece carrying jointing knives, of a plate adapted to be clamped against the face of said head-piece, said head-piece and plate having corresponding channels in their adj acent faces positioned between said jointing knives, and grooving knives carried in said channels, substantially as described.

2. In a cutter-head of the class described, the combination with a head-piece having two series of bolt-holes formed therethrough, of slotted bolts engaging one series of said bolt-holes, jointing knives passed through the slots of said bolts and drawn against the side of the head piece by the latter, a series of grooving knives in alternating relation to said jointing knives, an apertured clampplate, and bolts engaging the other series of holes in said head-piece and the apertures of said clamp-plate and securin said grooving knives between said clamp-p ate and headpiece, the opposed sides of said head-piece and clamp-plate being channeled to receive said jointing and grooving knives, respectively, substantially as described.

3. In a cutter-head of the class described, the combination with a head-piece having bolt-holes formed therethrough, of a clampplate provided with bolt-holes registering with said bolt-holes of the head-piece and also having channels formed in its inner side, said channels extending across one side of said bolt-holes, grooving knives fitted to said channels of the clamp-plate, and bolts engaging said bolt-holes and clamping said grooving knives between said clamp-plate and headpiece, said bolts having transverse notches engaged by the inner edges of said grooving knives, substantially as described.

HARRY B. ROSS.

WVitnesse-s:

T. M. RANDALL, B. O BLOMSTROM. 

